Democrats to back gay marriage at convention

The Democratic Party is set to include a pro-gay-marriage plank in their party convention platform, according to a Democratic source.

The language was included as the first step in the platform process. The platform drafting committee met in Minneapolis this past weekend. Next, the full platform committee will be consider it in Detroit in two weeks and then, it will go to the convention delegates in Charlotte for final approval.

No specific language of the platform plank was made available.

The Washington Blade, which broke the news, also reported -- and the source confirms -- that it was approved unanimously and "the platform approved on Sunday not only backs marriage equality, but also rejects DOMA and has positive language with regard to the Employment Non-Discrimination Act."

*** UPDATE *** NBC's Domenico Montanaro notes: The National Republican Senatorial Committee points to a Wall Street Journal report in May which notes Democratic Senate candidates who have not backed the president's position on gay marriage.

"The below Wall Street Journal article from this past May includes the names of a number of Democratic Senators and candidates that you might consider asking for their reaction to this news today…," the NRSC notes in an email.

"Sen. Jon Tester in Montana, Sen. Claire McCaskill in Missouri and former Gov. Tim Kaine in Virginia have declined to support same-sex marriage, even as Mr. Obama's backing has galvanized the party's liberal wing and activist ranks. Even senators facing less-competitive races—Bob Casey of Pennsylvania, Joe Manchin of West Virginia and Bill Nelson of Florida—have sought distance from Mr. Obama on same-sex marriage."

Democrats maintain a 53-47 advantage in the Senate, including two Independents who caucus with the Democrats. Control is up for grabs this fall with Democrats on defense in many races.